Get all record from collection , if match at least one record in second collection on MongoDB

I have two collection. User and Course

Get all record from collection , if match at least one record in second collection on MongoDB

I have two collection. User and Course

Use array values as path to match documents in mongodb

Given a list of documents like:

Use array values as key in $match stage mongodb

Given a list of documents like:

MongoDB – Overwrite the whole array field instead of its item

I have this schema:{ key: [] }. I want to convert it to { key: { foo: number } }.

Preserve all groups generate by first $group when using the second $group in MongoDB aggregation

I have one collection that the structure of the record look like this,

How to collect common attribute names in mongodb?

I’m new to mongodb. I have version 4.4

mongod multi nested is not working as expected

I have some doubts with $in here , I have following type of documents in my db:

How can I filter an ISODate field based only the in the time in MongoDB

I have a collection with the following structure in MongoDB:

Mongo Data API find documents count

Can the total document count be extracted using Mongo Data API? If there are a million records in the Mongo DB collection I need the count.